Regional Seismicity Regional Seismicity
Narrow your search for information by selecting a category in which you have a question, or simply scroll down the page to browse all the questions in this FAQ.
Where can I find a list of activities only?
Where can I find the answers to the activities?
Where can I search the concepts covered in this module?
Are there non-tectonic earthquakes?
Can human activity affect earthquakes?
What does the epicenter of an earthquake actually represent?
What's the difference between a hypocenter and an epicenter?
Where can I see illustrated examples of the properties of faults and associated features?
How does slip along faults occur?
What are the strike and dip of a fault?
How do you find the strike and dip of a fault, and why is this useful?
What are the footwall and hanging wall of a fault?
What is a fault's sense of slip?
How can the footwall and hanging wall of a fault help you determine the sense of slip?
Where can I see an animation of normal slip motion? Of reverse slip? Of thrust or blind thrust faulting? Of strike-slip motion?
Are there animations of oblique-slip faulting?
What is a slip rate, as it pertains to faults?
Are all strike-slip faults vertical in dip?
Can a lateral fault create a scarp?
Is a change in topography always connected with earthquake activity?
To what do the terms horst and graben refer?
What is a sag pond, and how is one formed?
How do aftershocks differ from other earthquakes?
Can we identify foreshocks, and thus predict a mainshock?
Why do big earthquakes only happen in the early morning?
Are you sure big earthquakes don't usually happen in the early morning?
Did the Landers earthquake of 1992 spawn other earthquakes, hundreds of kilometers away?
Whatever became of the Parkfield Earthquake prediction?
What is the Eastern California Shear Zone?
Can I see a graphical representation of the Richter magnitude scale?
What's the difference between magnitude and intensity?
Is the Richter Scale still used?
Why do scientists sometimes revise the magnitude of large earthquakes?
What are those "beach ball" symbols that appear on maps and diagrams, and what do they represent?
How is a focal mechanism or fault plane solution determined?
Has a large earthquake ever been successfully predicted?
Has there ever been an official earthquake prediction in the United States?
Where can I find a real-time map of California earthquakes?
Where can I search a catalog of southern California earthquakes?
